Currently has the same contents as struct SpatialLayer. Intention is to add a ScalabilityMode member, which isn't appropriate for a spatial layer. Bug: webrtc:11607 Change-Id: I75c9e9b39407e3f24ec117bb17dc37830076b26f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/262255 Reviewed-by: Rasmus Brandt <brandtr@webrtc.org> Commit-Queue: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/main@{#37062}